Introduction to the Central Axis Tree Array: The Central Axis Landscape Avenue of the Olympic Park is the northern end of the central axis of Beijing. It is gradually and continuously arranged with green spaces and tree arrays, creating a natural sense of the forest park and the modern sense of the Bird's Nest. Harmonious transition. The central axis tree array area is 2.4Km long and 100m wide, with 9 types of designed seedlings and a total of 2942 trees. Among them, there are 554 D20~25cm ginkgo trees on both sides of the central axis avenue. Including ginkgo, Pinus tabulaeformis, Poplar tomentosa, Sophora japonica, Mantou willow, Fraxinus microphylla, Luan tree, Maple maple, Begonia, etc. So far, a total of 2,133 seedlings have been completed.